If two gases $CH_4$ and $SO_2$ are allowed to enter from the two ends of a $1 \ km$ long vacuum tube at the same time,where will the gases meet from the $CH_4$ end (in $m$)?

If $P_1$ is the partial pressure of a gas and $x_1$ is its mole fraction in a mixture,then the correct relation between $P_1$ and $x_1$ is:

What is the order of intermolecular forces in solids,liquids,and gases?

Sulphur dioxide $(SO_2)$ and oxygen $(O_2)$ were allowed to diffuse through a porous partition. $20 \ dm^3$ of $SO_2$ diffuses through the porous partition in $60 \ seconds$. The volume of $O_2$ in $dm^3$ which diffuses under the similar conditions in $30 \ seconds$ will be (atomic mass of sulphur $= 32 \ u$)

It is recommended that a liquid ammonia bottle should be opened after cooling it in ice for some time. This is because liquid ammonia:

At a given temperature,the rate of diffusion of methane is twice that of gas $X$. The molecular weight of $X$ is ...... .